aria2 is a multi-protocol & multi-source, cross platform download utility. The supported protocols are HTTP(S), FTP, BitTorrent, Metalink. It can download a file from multiple sources/protocols and tries to utilize your maximum download bandwidth.

aria2 1.18.6

Release Note

This release fixes several bugs reported in github issues and adds a
feature to make RPC authentication more resilient to certain attacks.
New option --pause-metadata is added.  The explanation is a bit log,
so check the changelog and manual.  The session is now only saved if
there are changes from the last saved state.

From this release, MinGW32 build uses Windows native TLS
implementation and no longer use OpenSSL library.


* Disard cache when checking checksum

  This will slow down checksum checking but does not thrash cache.

* Compat with libuv 0.11 (Unstable)

  Fixes #241

* Drop WinMessageDigestImpl.

  The algorithms the `CryptProv` on Windows supports does not
  currently include SHA-224, so there is a "dark spot" in this
  implementation. Also on Win XP < SP3, most of the SHA-2 family is
  not actually supported.  All other implementation provide support
  for MD5, SHA-1 and all of the SHA-2 family, hence drop the
  incomplete WinMessageDigest implementation in favor of any other
  supported implementation (at least the internal implementation is
  always available at compile-time).

* Add --pause-metadata option

  This option pauses downloads created as a result of metadata
  download. There are 3 types of metadata downloads in aria2: (1)
  downloading .torrent file. (2) downloading torrent metadata using
  magnet link. (3) downloading metalink file.  These metadata
  downloads will generate downloads using their metadata. This option
  pauses these subsequent downloads.

* Improve compiler/platform/libs information in logs

  Add and use usedCompilerAndPlatform().  This adds compiler
  information to INFO logs and the --version output, and may be
  helpful when trying to diagnose/reproduce user-reported problems.

  Also make INFO logs include usedLibs() output.

  Closes #235

* Fix use-after-free on exit with multi-file torrent download + DHT

  DefaultPieceStorage may be referenced by one of DHT task (e.g.,
  DHTPeerLookupTask), after RequestGroup was deleted, and even after
  RequestGroupMan was deleted.  DefaultPieceStorage has a reference to
  MultiDiskAdaptor which calls RequestGroupMan object on destruction.
  So when DHT task is destroyed, DefaultPieceStorage is destroyed,
  which in turn destroys MultiDiskAdaptor.  DHT task is destroyed
  after RequestGroupMan was destroyed, MultiDiskAdaptor will use now
  freed RequestGroupMan object, this is use-after-free.

* Fix bug that zero length file is not opened when flushing cache

  This bug was only seen when MultiDiskAdaptor was used.

* Support PREF_DIR change for Metalink files

  Reworked previous commit adeead6f0396e2f8551d1182972e277728fd6c8b,
  and now support changing PREF_DIR for Metalink downloads.

* Fix assertion failure when dir option of paused HTTP/FTP download is

  When the directory is changed via aria2.changeOption RPC method, we
  directly change first FileEntry's path using FileEntry::setPath().
  If there is no PREF_OUT option is given, basically file name is
  unknown, so we just set empty string and let the next run determine
  the correct file name and new directory is applied there.  But
  previous code does not reset length property of FileEntry, so the
  unexpected code path is taken when unpaused and its path expects
  path is not empty string.  This commit fixes this issue by setting
  length to 0 using FileEntry::setLength().

* Save session only when there is change since the last serialization

  This is a slight optimization not to cause useless disk access.
  This only applies to saving session automatically (see
  --save-session-interval).  aria2.saveSession and serialization at
  the end of the session are always performed as before.

  When serialization, we first check that whether there is any change
  since the last serialization.  To do this, we first calculate hash
  value of serialized content without writing into file.  Then compare
  this value to the value of last serialization.  If they do not
  match, perform serialization.

* Fix (unknown length) downloads larger than 2GiB

  Closes #215

* Fix F_PREALLOC based allocation on some OSX versions

* Use index.html as filename for conditional-get when file is missing
  in URI

  Previously we disabled conditional-get if file part is missing in
  URI.  But we use constant string "index.html" in this case, so we
  can do the same to determine the modification time.  In this patch,
  if we have file part in URI, we are not going to set absolute file
  path in FileEntry, since it prevents content-disposition from

* Always add README.html to dist_doc_DATA

  rst2html is required to produce README.html from README.rst.  We
  include generated README.html to distribution.  And rst2html is not
  required when compiling sources in distribution and always
  README.html is available.

* Validate token using PBKDF2-HMAC-SHA1.

  This change should make token validation more resilient to:
  - timing attacks (constant time array compare)
  - brute-force/dictionary attacks (PBKDF2)

  Closes #220

* Add --disable-websocket configure option

* mingw32: Enable wintls and compile with GMP

  By enabling wintls, we can use Windows certificate store to validate
  server's certificate.  Previously, we built windows build using
  openssl and since we don't bundle CA certificates, aria2 fails to
  validate server's certificate unless user setups their CA
  certificates.  GMP provides fast big integer calculations, whic is
  used in BitTorrent encryption.

* AppleTLS: Enable BEAST mitigations in ST

  Only available in 10.9+, but since we might be building on a
  previous version but running on 10.9+, always try to set the option.

* WinTLS: Accept chains with no revocation information.

  This is kind what browser do anyway (IE, Firefox, Chrome tested),
  what AppleTLS does, what GnuTLS does and what OpenSSL
  does. Actually, most browsers will also be OK with the CRL/OCSP
  provider being offline.  WinTLS will still fail in that case.

  Should revocation information be available in the trust chain (CRL
  or OCSP) the certificate still will be checked!

  "Real" CAs, aka. those provided by the OS or system CA bundle,
  usually provide revocation information and are thus still checked.
  It should be mostly (only?) custom (organization) CAs that lack
  revocation information, but those users might want to use aria2 in
  their intranets and VPNs anyway ;)

  See #217

* Fix GnuTLS 2.x compatiblity

  Closes GH-216

* AppleTLS: Use newer, non-deprecated API in 10.8+


aria2 1.18.5

Release Note

This release fixes BitTorrent download failure on Mingw build.


* Ignore error when setting DSCP value

  Setting DSCP is additional feature and failure to enable it should
  not abort download entirely.  This change fixes the bug that windows
  build does not perform bittorrent downloads.


aria2 1.18.4

Release Note

This release adds new RPC authorization mechanism using --rpc-secret
option.  The existing --rpc-user and --rpc-passwd options are now
deprecated, and all applications using RPC API is strongly encouraged
to migrate to the new mechanism.  See RPC INTERFACE section in aria2
manual page for the details.  The new RPC method, aria2.saveSession,
was added, which tells aria2 server to save session file immediately.
There are several enhancements and bug fixes.  See the changes for the


* Added support for RPC channel encryption in aria2rpc

  Patch from David Macek

* Add aria2.saveSession RPC method

  This method saves the current session to a file specified by
  --save-session option. This method returns "OK" if it succeeds.

* Add numStoppedTotal key to aria2.getGlobalStat() RPC method response

  It shows the number of stopped downloads in the current session and
  not capped by --max-download-result option. On the other hand, the
  existing numStopped key also shows the number of stopped downloads,
  but it is capped by --max-download-result option.

* Better handling of 30x HTTP status codes


* Implement new RPC authorization using --rpc-secret option

  Add future deprecation warning to --rpc-user and --rpc-passwd.  Warn
  if neither --rpc-secret nor a combination of --rpc-user/rpc-passwd
  is set.

* Add --enable-color option to enable/disable terminal color output

* Add DSCP support

* gnutls: Don't fail handshake if returned error is not fatal

* Add workaround GnuTLS bug with OCSP status extension and
  non-blocking socket

  GnuTLS version 3.1.3 - 3.1.18 and 3.2.0 - 3.2.8, inclusive, has this
  bug. For these versions, we disable OCSP status extension.

* Make GnuTLS log level dependent on the aria2 ones


aria2 1.18.3

Release Note

This release fixes the bug which may cause assertion failure after
multi-file downloads (e.g., multi-file metalink or torrent) are
performed several times due to the bad handling of --bt-max-open-files


* Fix crash if unpause failed before assigning BtProgressInfoFile

* Enable and check PIE in makerelease-osx

* Fix bug that numOpenFile_ is not reduced when MultiDiskAdaptor is

  This bug caused assertion error in


aria2 1.18.2

Release Note

This release fixes the wrong handling of return value of fork(), which
leads to high CPU usage. The progress readout has some color output.
Mingw32 build now receives colorized output. Mingw32 build now can
read unicode command-line arguments. The build script of OSX was
rewritten. The --bt-max-open-files now limits the number of opened
file globally for multi-file downloads instead of per download basis.


* Remove the outdated, broken

* Initial revision of the a new OSX release Makefile

* Allow using libgmp with AppleTLS/WinTLS

* Fix crash when metaurl contains unsupported URI or text

* Fix bad fork() return value handling

* Use some colors in progress reports (where available)

* Implement basic color support for the Windows console

  Only \033[*m (SGR) is supported, with a 16+16 color terminal.

* AppleTLS: Implement PKCS12 loading.

* Limit number of opened file globally with --bt-max-open-files option

  This change changes the behavior of --bt-max-open-files. Previously,
  it specifies the maximum number of opened files for each multi-file
  download. Since it is more useful to limit the number globally, the
  option now specifies the global limit. This change suggests that
  aria2.changeOption() method now ignores --bt-max-open-files and
  aria2.changeGlobalOption now reads it and dynamically change the

* Don't fail multiple concurrent dl same file if auto-file-renaming is

* mingw32: Use CommandLineToArgvW() and GetCommandLineW() to read
  cmd-line args

  This change enables aria2 to read unicode characters in


aria2 1.18.1

Release Note

This release fixes the percent-encoding bug which affects file name
encodings. It adds PKCS12 support in certificate import. It also adds
experimental internal implementation of message digest functions, ARC4
cipher and bignum. It means that no external libraries are required to
build BitTorrent support, but this feature is still marked as
experimental. This release also fixes the android build with NDK r9.


* LibsslTLSContext: Remove weak cipher suite

* AppleTLS: Enable --certificate

* util::percentEncodeMini: Fix regression bug removed unsignedness

  srange-based for around std::string is convenient but several
  functions depend unsigned char for correctness and readability.

* Log exception; throw error if loading private key and/or certificate

* Provide internal ARC4 implementation

  Now you can build bittorrent support without without external
  libraries, meaning you can skip libnettle, libgmp, libgcrypt, GnuTLS
  and OpenSSL on OSX (for now).

* Internal implementation of DHKeyExchange

  Reusing a bignum (well, unsigned very-long) implementation I had
  lying around for years and just cleaned up a bit and brought to
  C++11 land.

  It might not be the most performant implementation, but it shoud be
  fast enough for our purposes and will go a long way of removing
  gcrypt, nettle, gmp, openssl dependencies when using AppleTLS and
  WinTLS (upcoming).

* PKCS12 support in --certificate and --rpc-certificate options.

* Add --disable-ssl configure option

* Add internal md5 and sha1 message digests

* Fix AppleMessageDigestImpl use with large data

* Set old cookie's creation-time to new cookie on replacement

  As described in

* Fix link error with Android NDK r9

  Since Android ndk r9, __set_errno is deprecated. It is now defined
  as inline function in errno.h. The syscall assembly calls
  __set_errno, but since does not export it, the link
  fails. To workaround this, replace all occurrences of __set_errno
  with a2_set_errno and define it as normal C function.


aria2 1.18.0

Release Note

This release changes the default disk cache size to 16 MiB. To change
the default size, --with-disk-cache configure option was added.  Now
used URIs are also saved by --save-session option. The control file is
now always saved if --force-save is given. The ctrl-c handling on
Mingw build was improved. The internal intl library is no longer
supplied. From this release, C++11 compiler is required to build aria2
executable. For gcc, at least 4.6.3 is required.


* Use AM subdir-objects

  Doing so in AM_INIT_AUTOMAKE seems to be the most compatible way of
  doing so.

  Closes GH-120

* AM_SILENT_RULES([yes]) with backwards-compatiblity

  Supported since automake-1.11. There is no point in having the very
  verbose compile stuff running about, which cannot even silenced
  properly with `make -s` by default. Otherwise, `make V=1` or
  `--disable-silent-rules` are your friends

* Fix automake-1.14 am_aux_dir

  AC_USE_SYSTEM_EXTENSIONS will cause AC_PROG_CC, which is overridden
  by automake-1.14, which will then init (part) of automake, in
  particular am_aux_dir expansion, which in turn relies on ac_aux-dir,
  which is not initialized at this point, and thus: certain doom (or
  fun, depending on your POV and mood :p)

  Hence call AC_USE_SYSTEM_EXTENSIONS only after
  AM_INIT_AUTOMAKE. This, of course, caused a lot of related macro

  Tested against automake-1.10 (OSX Lion/XCode version) and
  automake-1.14 (homebrew version)

* Require external gettext for --enable-nls

  And stop using the internal flavor with ./intl

* Make AX_CXX_COMPILE_STDCXX_11 test for -stdlib=libc++ via std::shared_ptr

  The clang shipped with OSX XCode and clangs not build enabling
  libcpp, will default to the libstdc++ headers and lib installed on
  the system.  In the OSX case, that libstdc++ is the one bundles with
  gcc-4.2, which is far too old to provide all required C++11 types,
  such as std::shared_ptr.  Hence, the C++11 check should try to
  compile a program with a C++11 type and try -stdlib=libc++ if the
  default lib fails to compile said program.

* Make the configure check for C++11 compiler mandatory

  Remove stray "dnl", so that mandatory actually works with (my)

* Always build doc/manual-src

  Should sphinx-build be not available AND the man file not be prsent,
  then just "touch" it into existence (and warn about that)

* Win: Use SetConsoleCtrlHandler for SIGINT/SIGTERM

* Implement a simple resource lock (threading)

  In this initial implementation Locks are no-ops on platforms other
  than Windows.

* Check for sphinx-build during configure

* Add --with-disk-cache configure option

  Enables packagers more fine grained control over the default value
  without having to mess with config files.

  See GH-115

* Change defaults: Enable 16M disk cache by default.

* Always save control file if --force-save is given

* Set log level DEBUG for unittests

* Check that C++ compiler supports override keyword

  If the compiler supports override, define CXX11_OVERRIDE as
  override, otherwise define it as empty. Use CXX11_OVERRIDE instead
  of override.

* AppleTLS: Fix MessageDigestImpl

* AppleTLS: Fix session CFRelease stuff

* Use AX_CXX_COMPILE_STDCXX_11 macro to detect C++0x/C++11 support in

* Require -std=c++11 and use std::shared_ptr instead of SharedHandle

* Join URI on redirect

* Send HAVE message to the peer which the piece is downloaded from

  Historically, aria2 did not send HAVE message to the peer which the
  piece is coming from, thinking it is obvious that the peer knows we
  have the piece. But it is not obvious if one piece is download from
  more than 1 peers (e.g., end game mode). So it is better to send
  HAVE to all peers connected.

* Improvements to --follow-torrent=false documentation.

  Patch from gt

* SessionSerializer: Truly unique URIs

  Before, only spent uris where sanitized not to be contained within
  remaining uris. Change this so that each uri in the
  union(remaining,spent) get saved once at most.  The order of the
  uris will won't be changed, with remaining uris going first followed
  by spent uris.

  Also avoid copying the uri std::strings around during dupe checking,
  usually resulting in better performance regarding CPU and space.

* Make getOption RPC method return option for stopped downloads

* SessionSerializer: Save spent URIs as well as remaining ones

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